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Basically: the official version of this 1975 California Supreme Court case is found in Volume 13 of the California Reports, 3rd series at page 804. Unofficial versions appear in Volume 119 of the California Reporter and Volume 532 of the Pacific Reporter, 2nd

So for the official version:

Volume= 13

Reporter= California Reports 3rd Series

Page= Beginning at page 804

The citations given after the first, official cite are known as unofficial or parallel citations. The text of the opinion is the same in all sources, whether they are designated as official or unofficial.